Dendrobium Questions

[scy]

I have been thinking about getting another orchid or two to add to my collection, especially since my husband said, "If orchids make you happy, why don't you buy some more?" In my search for something that would stand out yet be space efficient, I am considering getting a dendrobium victoria-regina and dendrobium goldschmidtianum. I have found a few vendors that have the victoria-regina but no luck in finding a fuchsia goldschmidtianum. Would anyone happen to know of a reputable vendor that carries this?

However, I am not certain if my growing conditions will be ideal for them. Here are my growing conditions:
* Winter Day Temps: (sunny) 75-90 F; (cloudy) 55-70 F
* Winter Night Temps: 45-55 F (Have heating pad if needed)
* Low humidity
* Some air flow (central air vent is above orchids on a high ceiling)
* Growing indoors only on a windowsill.

Would these thrive in my growing conditions? I am also considering growing them semi-hydroponically, but if they definitely will not take to it, then I am open to other suggestions.

Are there any specific care instructions I should be aware of for these?

The dendrobium victoria-regina I am considering is currently mounted. If my humidity is too low for mounts, can I pot it up or would that be a bad idea, since it is accustomed to drier/more airy conditions?

Thanks for the help!